PARTENTRY STRUC
peBootable db ? ;80h = bootable, 00h = nonbootable
peBeginHead db ? ;beginning head
peBeginSector db ? ;beginning sector
peBeginCylinder db ? ;beginning cylinder
peFileSystem db ? ;name of file system
peEndHead db ? ;ending head
peEndSector db ? ;ending sector
peEndCylinder db ? ;ending cylinder
peStartSector dd ? ;starting sector (relative to beg. of disk)
peSectors dd ? ;number of sectors in partition
PARTENTRY ENDS
The PARTENTRY structure specifies the size and the starting and ending sectors of a partition on a disk that can be partitioned.
peBootable
Specifies whether the partition is bootable. If this field is 80h, the partition is bootable; if the field is 00h, the partition is not bootable.
peBeginHead
Specifies the head number used to determine the first track in the partition.
peBeginSector
Specifies the number of the first sector in the partition. This sector number is relative to the first track in the partition.
peBeginCylinder
Specifies the cylinder number used to determine the first track in the partition.
peFileSystem
Specifies the type of file system. This field can be one of the following values:
| Value | Meaning |
| 00h | Unknown type |
| 01h | 12-bit file allocation table (FAT); partition smaller than 10 MB |
| 04h | 16-bit FAT; partition smaller than 32 MB |
| 05h | Extended DOS partition |
| 06h | 16-bit FAT; partition larger than or equal to 32 MB |
Although other values are possible, MS-DOS recognizes only those given.
peEndHead
Specifies the head number used to determine the last track in the partition.
peEndSector
Specifies the number of the last sector in the partition. This sector number is relative to the first track in the partition.
peEndCylinder
Specifies the cylinder number used to determine the last track in the partition.
peStartSector
Specifies the number of the first sector in the partition. This sector number is relative to the beginning of the disk.
peSectors
Specifies the number of sectors in the partition.
MS-DOS supplies a partition table for every disk that can be partitioned. The table, placed at the end of the first hidden sector on the logical drive, consists of one or more PARTENTRY structures.
Interrupt 21h Function 440Dh Minor Code 41h Write Track on Logical Drive
Interrupt 21h Function 440Dh Minor Code 61h Read Track on Logical Drive